Yeah, my first thought was that running is probably a bad idea at the minute. Sleeping with a pillow under my knees worked wonders for me, as did very regular gentle movement - keeping still was a killer. I'm a bit of a swimming junkie too - that will contribute to strengthening muscles to keep everything in place, but without any impact.
Sometimes lying on the floor with my knees bent worked to slot everything back in place, but at least some of the time that was really unhelpful. Whatever you do, if you think you're about to sneeze or cough, protect your poor back! If possible, get into the foetal position, or child's pose in yoga. The absolute worst pain I've ever been in was when I was lying totally flat on the floor, trying to improve things, and I sneezed. Ugh.
While you're twiddling your thumbs and waiting for it to improve, don't lift anything remotely heavy (no matter how good your technique is), avoid crossing your legs, avoid unsupportive chairs and sit, stand or lie as evenly as possible. And, as July says, try to get referred to an osteopath. Those people be gods.
